[Boatanchors] 5X4 tube?

[mac]

 From Sibley:  5U4G w/ pinout scrambled, reportedly to prevent  
substitution of a (lower rated) 5Y3.  Common in (unique to?) '30s  
Philcos

Dennis D. W7QHO
Glendale, CA



On Jun 22, 2010, at 7:49 PM, Kenneth Grimm wrote:

> The 1948 RCA tube manual says that it has the same ratings as the  
> 5U4G.
>
> Ken - K4XL
>
> On Tue, Jun 22, 2010 at 10:38 PM, WW6N <yonglee at yonsei.ac.kr> wrote:
>
>> Does someone know about 5X4 tube?
>> It is not 5v version of 6X4.
>> I could not find any data about it.
>> It is RCA made and has an octal socket.
>> Looks similar to ST type 5R4.
>> de WW6N
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